There is no one ‘correct’ setting for flash photography, but here’s a good stock setting for indoor flash portraiture like this. Set your camera to manual exposure mode at 1/200 sec and ISO100. Choose a mid-range aperture like f/8 then take test shots. You might want to adjust your aperture as you shoot to allow for more or less light. Along with ISO, aperture and shutter speed, the flash is a fourth factor that turns the exposure triangle into an exposure square, as the flash power can be used to control the amount of light.
If you want to shoot polished, professional-looking portraits, then knowing how to light a face with a flash is one of the most worthwhile skills you can master. To the uninitiated it can seem a bit daunting, but if you break the technique down into fundamentals then there’s no need for concern.
